Embedded Training Content --Bash Programming

#!/bin/sh
if [ -e lock ];then
    echo "file exists"
    echo "delete it now..."
    rm -f  lock
    echo "done"
else
    echo "file not exists"
    echo "create it now..."
    >lock
#    touch lock
    echo "done"
fi

#!/bin/bash
case `uname -s` in
    *Linux*)
        os="Linux";;
    *UNIX*)
        os="UNIX";;
    *)
        os="unknown";;
esac
case `uname -r` in
    ?.6.*)
        kernel="2.6";;
    ?.4.*)
        kernel="2.4";;
    *)
        kernel="unknown";;
esac
architecture=`uname -m`
case $architecture in
    i?86)
        machine="x86 series";;
    *)
        machine="non-x86 series";;
esac
#output the gathered info
echo "OS=$os,Kernel=$kernel,architecture=$machine"

#!/bin/bash
cpu=` cat /proc/cpuinfo | grep "model name" `
case $cpu in
    *Celeron*)
        productor="Intel Celeron"
        case $cpu in
            *\ M\ *)
                mobile="yes";;
            *)
                mobile="no";;
        esac
        ;;
    *AMD*)
        productor="AMD Com.";;
    *)
        productor="unknown com.";;
esac
echo "CPU Productor:<$productor>,MobileVersion:<$mobile>"

#!/bin/bash
[ -f lock ] ||exit 0
echo "lock file exist."
echo "begin to delete it..."
[ -f lock ] && rm -f lock
echo "delete it ok"

#!/bin/bash
#this script can enumerate all files of a directory
#and check if a file is executable then execute it
#remain problem:
#The variable i get value from `ls $dir` but it's a dead loop and it can only get executable files except regular files
#what's the matter?
#The problem hasn't been solved.
echo "begin"
index=1
dir=/home/creatory/Test/20090805_Wednesday/
#ls $dir
if test -d $dir;then
for i in `ls $dir` ;do
    echo "No:$index  Filename:$i"
    index=`expr $index + 1`
#    [ -f $i ] || continue
    if [ -x $i ];then
        echo executing $i ...
        $dir/$i
    else
        echo skipping $i,no executable permission.
    fi
    sleep 1
    done
else
    echo $dir does not exists.
fi
echo "end"

#!/bin/bash
#this script demonstrates how to use environment variables in shell script
#alternative choice style in case : value1 | value2 )
#for example: root|creatory)

#$LOGNAME
case $LOGNAME in
    #root|creatory)
    root)
        echo "You've sovereign permission.You can do everyting what you want."
        ;;
    *)
        echo "Your permission is restricted.Some important operation are being protected."
        ;;
esac

author:[email protected]
modify time:08/08/2009 training time:08/05/2008 Wednesday
place:ZPark,Beijing,China